You can see the internal (bone) name displayed in the parameters pallet when that actor is selected.

Or in the cr2, use a text editor's search function  to search for the the 'display name' the name that appears at the top of the parameters pallet when that actor is selected. The actor's internal (bone) name will be a couple of lines or so above that.

actor lEye:1
    {
    name    LeftEye